Letrozole placebo clinical trials

Phase III Study to Assess AZD9833+ CDK4/6 Inhibitor in HR+/HER2-MBC With Detectable ESR1m Before Progression (SERENA-6)

This study is testing a new drug, AZD9833, for advanced breast cancer. It's for people whose cancer has a specific gene change (ESR1 mutation) and are already on certain treatments. Researchers want to see if adding AZD9833 works better than current medicines.